public class Son extends Father{
    public void method(){
        System.out.println("son method.");
    }

    public void diff_method(){
        this.method();
        super.method();
    }

    public static void main(String[] args) {
        Father father = new Father();
        father.method();
        Son son = new Son();
        son.method();
        son.diff_method();
    }
}
